Offset Cooling Module in Oil-Injected Screw Compressor

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Solution Overview

Problem

Conventional oil-injected screw compressor installations face challenges such as sequential assembly and removal complexities, high noise emission, and inefficient frame utilization due to fixed component positions, particularly with air-cooled cooling modules and integrated dryers.

Innovation Solution

The oil-injected screw compressor installation repositions components on the underframe, with the air-cooled cooling module placed perpendicular to the compressor element, allowing for flexible assembly, reduced noise, and separate dryer attachment, utilizing an oil-cooled motor to eliminate the need for warm and cold compartments and minimizing oil and pressure pipes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the air-cooled cooling module is placed laterally over the compressor element, then the warm and cold compartments are created for proper motor functioning, but the assembly and removal procedures become sequential and complex

Engineering Contradiction:
Improvemotor functioningVSAvoidassembly procedure
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The cooling module is repositioned from a lateral placement (horizontal dimension) to a perpendicular placement (vertical/different spatial dimension) relative to the compressor element. This dimensional change allows the cooling module to be positioned at the rear end of the compressor element, creating clear accessibility for both components simultaneously and eliminating sequential assembly requirements while maintaining the warm/cold compartment functionality through adjusted air duct positioning

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Area of stationary object

If the air-cooled cooling module is aligned with the contour of the frame, then the structure is compact, but the noise emission becomes very high and cooler removal for cleaning is difficult

Engineering Contradiction:
Improveframe utilizationVSAvoidnoise emission
Core Design Contradiction:
Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The cooling module is extracted from the frame contour alignment and repositioned perpendicular to the compressor element at the rear end. This extraction creates physical separation between the cooling module and the frame structure, allowing noise reduction through increased distance from the compressor element while maintaining compact overall dimensions. The perpendicular positioning also provides clear access for cooler removal and cleaning operations

Inventive Principle:
Principle #2Taking out (Extraction)

3Adaptability or versatility

If the dryer is integrated on the underframe, then the compressor installation is complete, but the frame size increases or unused zones are created when dryer is not needed

Engineering Contradiction:
Improveconfiguration flexibilityVSAvoidframe size
Core Design Contradiction:
Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The underframe is designed with universal mounting positions and standardized connection points that can accommodate various configurations - with or without dryer, with different cooling module positions, and with different component arrangements. This universal design allows the same base frame to serve multiple functions and configurations, eliminating the need for oversized frames while maintaining adaptability for optional dryer integration

Inventive Principle:
Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration simplifies assembly and maintenance, reduces noise, optimizes frame usage, and decreases the number of required pipes, providing greater flexibility and accessibility for components while allowing for easier integration of a dryer as needed.

Implementation Method 1

The air-cooled cooling module comprises coolers and means for forcing a cooling air flow through the coolers

Methodology Applied
Scientific EffectForced Convection: Forced Convection

Implementation Method 2

an oil separator vessel and an air-cooled cooling module being placed on the other side of the frame

Methodology Applied
Scientific EffectCentrifugal Separation: Centrifugal Separation

Data Source

PatentUS11365737B2Oil-injected screw compressor installation in which cooling module is offset from compressor element
Publication Date: 2022.06.21 ATLAS COPCO AIRPOWER NV
  • US11365737B2 patent drawing
  • US11365737B2 patent drawing
  • US11365737B2 patent drawing

AI summary

Oil-injected screw compressor installation including a frame or underframe (5 2), a screw compressor element (3), electrical cabinet (6), oil separator vessel (5) and an air-cooled cooling module (8), with as characteristic that on one side (2a) of the frame (2), the screw compressor element (3) is placed horizontally and with the electrical 10 cabinet (6), the oil separator vessel (5) and the aircooled cooling module (8) being placed on the other side (2b) of the frame (2), with the cooling module (8) being placed such that this is perpendicular to the compressor element (3) and the air (9) sucked in by the cooling module 15 (8) will flow between the electrical cabinet (6) and the cooling module (8).